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fabric flow 1-8-08 - Flow Through Fabrics Douglas J Gardner...

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1 Flow Through Fabrics Douglas J. Gardner Professor Wood-Polymer Hybrid Composites Fabric Preform Issues • Permeability • Compressibility Ease of handling • Drapeability Strength, stiffness and fiber volume fraction
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2 Darcy’s Law L p k A q v Δ Δ = = η ' ' v’ = velocity cm/s q’ = flow rate cm 3 /sec A = cross section cm 2 η = viscosity cps k = permeability cm 3 flow/sec(cps)(cm length)/(cm 2 (area))(atm pressure drop) p = pressure atm L = length cm Darcy Units K, cm 2 ·cps/sec·atm = 1 Darcy For a porous medium having a permeability of 1 Darcy, a fluid with a viscosity of 1 cps will flow at 1 cm 3 /sec per 1 cm 2 cross section with a pressure drop of 1 atm per cm length.
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